CVE-2017-18903 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting Mattermost Server versions prior to 4.0.0, 3.10.2, and 3.9.2, specifically when Cross-Origin Resource Sharing (CORS) is enabled. This vulnerability carries a high CVSS score of 8.8, indicating a critical risk due to its network-based attack vector, low attack complexity, and potential for high impact on confidentiality, integrity, and availability. While the vulnerability has a low EPSS score and is not listed in CISA's KEV catalog, there is no public exploit code available (e.g., Metasploit, Nuclei, ExploitDB), and community discussion and media coverage are minimal, suggesting it is not actively exploited in the wild.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.9.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | ||
>= 3.10.0, < 3.10.2CPE matchmatch criteria | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.